Little Stour Books - Offering rare, used and antiquarian books. - http://www.littlestourbooks.com/
LughnassadhBooks.com - New, used, and out-of-print books. - http://www.lughnassadhbooks.com/
Librairie Sourget - Illuminated books, manuscripts, horae, incunabula, literature, bindings and works from 15th to 19th century. - http://www.librairie-sourget.com
Lemuria Books - Signed first editions, stock includes Southern writers, Civil War, and children's books. - http://www.lemuriabooks.com/
La Pluma Blanca - Used and out of print books. - http://asamee.bizland.com/
LaPointe's Used Books - Used books on a searchable website. - http://www.lapointesbooks.com/
Librairie Hatchuel - French antiquarian books on history of ideas, politics, economics, social sciences, and philosophy. - http://www.hatchuel.com/main.php?lg=2&dev=1
Lion and Phoenix Books - Rare, used, and out-of-print books; specializing in paperbacks and digests, first editions. - http://www.lpbooks.com/
Liber Antiquus - Selection of early printed books, covering a broad range of topics and disciplines. - http://www.liberantiquus.com/
Loganberry Books - Used and rare books, specializing in children's and women's titles. Include a book identification service. - http://www.logan.com/loganberry/
LB BK Store - Offers stock available in conventional set prices and auction format. - http://www.lbbk.com/
Lucky Dog Books - Online request service for used hardbacks, paperbacks, LPs, cassettes, CDs, and videos. - http://www.luckydogbooks.com/
Lymelight Books & Prints. - Antiquarian and secondhand books; specialities are art, geology, illustrated, literature, natural history, poetry, Topography and travel. Large general stock. - http://www.lymelight-books.demon.co.uk/
Lynge and Søn - Antiquarian booksellers; Browse by subject or search by keyword. - http://www.lynge.com/
Librairie Minet Frères - dealers of early printed and rare books with a preference for the Ancien Regime (in French and English). - http://www.anticbooks.com/
Louis Collins Books - Specializing in scholarly out-of-print books, especially anthropology of the world. - http://www.collinsbooks.com/